title: Bone scans after total knee arthroplasty in asymptomatic patients. Cemented versus cementless.
abstract: The natural history of bone scans after total knee arthroplasty (TKA) was studied in 26 patients with 28 cemented TKAs and 29 patients with 31 cementless TKAs. The bone scans were examined at specified postoperative intervals. Radionuclide activity of the femoral, tibial, and patellar regions was measured. Six patients who developed pain postoperatively were excluded. Bone scans immediately postoperative and at three months demonstrated increased uptake, which gradually decreased to baseline levels at ten to 12 months. Radioisotope uptake was comparable in the cemented and cementless groups, but was highly variable in individual patients and in each of the follow-up periods. A single postoperative bone scan cannot differentiate component loosening from early bone remodeling. Sequential bone scans, as a supplement to the clinical examination and conventional radiography, may prove useful in the diagnosis of TKA failure.
authors.affiliation: Division of Orthopedic Surgery, University of Utah Medical Center, Salt Lake City 84132.
authors.forename: A A
authors.initials: AA
authors.lastname: Hofmann
authors.forename: R W
authors.initials: RW
authors.lastname: Wyatt
authors.forename: A U
authors.initials: AU
authors.lastname: Daniels
authors.forename: L
authors.initials: L
authors.lastname: Armstrong
authors.forename: N
authors.initials: N
authors.lastname: Alazraki
authors.forename: A
authors.initials: A
authors.lastname: Taylor
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements; D004164:Diphosphonates; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging*; D007720:Knee Prosthesis / Q000009:adverse effects*; D008297:Male; D008875:Middle Aged; D010149:Postoperative Pain / Q000209:etiology; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011877:Radionuclide Imaging; D012086:Reoperation; D013667:Technetium; D017556:Technetium Compounds
chemical_list: D001843:Bone Cements; D004164:Diphosphonates; D017556:Technetium Compounds; D013667:Technetium; C029045:technetium Tc 99m diphosphonate